今日作业:
1、函数对象优化多分支if的代码练熟
if user_state:
list=[0,1,2]
dic={
'查询余额请输入','0'
'提现请输入','1'
'转账请输入','2'
}
while 1:
print(dic)
cmd=input('请输入指令:')
if cmd in list:
call(int(cmd))
break
else:
print('无效的指令')
continue
def call(x):
if x==0:#查看余额
check_money()
elif x==1:#提现
withdraw_deposit()
elif x==2:#转账
transfer()
2、编写计数器功能,要求调用一次在原有的基础上加一
温馨提示:
I:需要用到的知识点:闭包函数+nonlocal
II:核心功能如下:
def counter():
x+=1
return x
要求最终效果类似
print(couter()) # 1
print(couter()) # 2
print(couter()) # 3
print(couter()) # 4
print(couter()) # 5
周末作业
编写ATM程序实现下述功能,数据来源于文件db.txt
0、注册功能:用户输入账号名、密码、金额,按照固定的格式存入文件db.txt
1、登录功能:用户名不存在,要求必须先注册,用户名存在&输错三次锁定,登录成功后记录下登录状态(提示:可以使用全局变量来记录)
下述操作,要求登录后才能操作
1、充值功能:用户输入充值钱数,db.txt中该账号钱数完成修改
2、转账功能:用户A向用户B转账1000元,db.txt中完成用户A账号减钱,用户B账号加钱
3、提现功能:用户输入提现金额,db.txt中该账号钱数减少
4、查询余额功能:输入账号查询余额
user_state=0
def login():
list_1=[]
tag=1
# while tag:
with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f1:
name=input('请输入账户:').split()
for line in f1:
username=line.split(':')[0]
# print(username)
userpwd=line.split(':')[1]
count=line.split(':')[2]
# print(count)
money=line.split(':')[3]
if name == username:
print(name==usernane)
pwd=input('请输入密码').strip()
if userpwd==pwd:
print('登录成功')
user_state=name
tag=0
break
elif userpwd!=pwd:
print('密码错误')
count+=1
else:
...
else:
...
else:
print('用户不存在请注册')
# register()
if count == 3:
print('用户已锁定')
tag = 0
with open (r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f2:
for line in f2:
if line.split(':')[0] == user_state:
line = f'{username}:{userpwd}:{count}:{money}\n'
list4.append(line)
with open(r'C:\Users\Administrator\Desktop\db.txt', mode='wt', encoding='utf-8') as f3:
f3.write(list4)
def register():#注册功能
tag=1
name_exist=0
while tag:
with open (r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding="utf-8") as f1:
username=input('请输入要注册的账户:').strip()
for line in f1:
name=line.split(':')[0]
# print(name)
if name==username:
print('用户已存在')
break
tag=0
name_exist=1
else:
userpwd=input('请输入要注册的密码:').strip()
if name_exist==0:
with open(r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f2:
f2.write(f'{username}:{userpwd}:0:0\n')
break
login()
if user_state:
list=[0,1,2]
dic={
'查询余额请输入','0'
'提现请输入','1'
'转账请输入','2'
}
while 1:
print(dic)
cmd=input('请输入指令:')
if cmd in list:
call(int(cmd))
break
else:
print('无效的指令')
continue
def call(x):
if x==0:#查看余额
check_money()
elif x==1:#提现
withdraw_deposit()
elif x==2:#转账
transfer()
def check_money():#查询余额
with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f1:
for line in f1:
if line.split(':')[0]==user_state:
res=line.strip().split(':')[3]
print(res)
def withdraw_deposit():#提现
is_withdraw_deposit=0
with open(r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f1:
amount=input('请输入提款金额:')
if not amount.isdigit():
print('输入错误')
else:
for line in f1:
if line.split(':')[0] == user_state:
money = line.strip().split(':')[3]
if int(res)-int(amount)>0:
left_money=int(res)-int(amount)
is_withdraw_deposit = 1
new_line=line.replace(f'{money}',f'{left_money}')
pass
else:
print('余额不足')
if is_withdraw_deposit:
list4=[]
with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f2:
for line in f2:
if line.split(':')[0] == user_state:
line=new_line
list4.append(line)
with open (r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f3:
f3.write(list4)
def transfer():#转账
is_transfer = 0
with open(r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f1:
transfer_name=input('请输入要转入的账户:')
amount=input('请输入转账金额:')
if not amount.isdigit():
print('输入错误')
else:
for line in f1:
if line.split(':')[0]==transfer_name:
pass
else:
print('不支持对外账户哦 0.0')
for line in f1:
if line.split(':')[0] == user_state:
money = line.strip().split(':')[3]
if int(res)-int(amount)>0:
left_money=int(res)-int(amount)
is_transfer = 1
new_line=line.replace(f'{money}',f'{left_money}')
pass
else:
print('余额不足')
for line in f1:
if line.split(':')[0] == transfer_name:
money2 = line.strip().split(':')[3]
left_money2 = int(money2)+ int(amount)
new_line2=line.replace(f'{money2}',f'{left_money2}')
if is_transfer:
list5=[]
with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f2:
for line in f2:
if line.split(':')[0] == user_state:
line=new_line
elif line.split(':')[0] == transfer_name:
line=new_line2
list5.append(line)
with open (r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f3:
f3.write(list5)